Weird sound in the cooling system when I turn off the engine on 2007 Mercedes-Benz GL450

I bought the car a few weeks ago and didn't notice it until a couple of days ago. When I turn off the engine, after a few seconds I hear a "ffffffff" sound. like if it was releasing some kind of pressure. Any one has any idea of what it could be??? Thanks.

by in Beverly Hills, CA on February 14, 2012
1 answer 1 comment
ANSWER by on April 30, 2012
This sounds like it is the airmatic sytem that is releasing air from the air suspension. It's normal.
COMMENT by on May 02, 2012
Thanks so much for your answer. What a relief :)

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